Here is a tip:

There are 2 types of meds for the prep. One is a drink of yucky stuff, like a gallon of it. The other is pills, you drink ginger ale with those. It is MUCH easier, and is the method they prescribe for the seniors, like my Dad. ASK for the pills!

You can NOT drink cola or any soda with a color to it, only ginger ale. But heck that is better than the yucky stuff!